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    Subject[PATCH] hmc6352: Add driver for the HMC6352 compass
    Date
    From: Kalhan Trisal <kalhan.trisal@intel.com>

    This driver will report the heading values in degrees to the sysfs interface.
    The values returned are headings . e.g. 245.6

    Cleanups requested now all folded in and a sysfs descriptio to keep Andrew
    happy.

    Signed-off-by: Kalhan Trisal <kalhan.trisal@intel.com>
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    ---

    .../ABI/testing/sysfs-bus-i2c-devices-hm6352 | 21 ++
    drivers/misc/Kconfig | 7 +
    drivers/misc/Makefile | 1
    drivers/misc/hmc6352.c | 199 ++++++++++++++++++++
    4 files changed, 228 insertions(+), 0 deletions(-)
    create mode 100644 Documentation/ABI/testing/sysfs-bus-i2c-devices-hm6352
    create mode 100644 drivers/misc/hmc6352.c


    diff --git a/Documentation/ABI/testing/sysfs-bus-i2c-devices-hm6352 b/Documentation/ABI/testing/sysfs-bus-i2c-devices-hm6352
    new file mode 100644
    index 0000000..fbedf77
    --- /dev/null
    +++ b/Documentation/ABI/testing/sysfs-bus-i2c-devices-hm6352
    @@ -0,0 +1,21 @@
    +Where: /sys/bus/i2c/devices/.../heading
    +Date: April 2010
    +Kernel Version: 2.6.36?
    +Contact: alan.cox@intel.com
    +Description: Reports the current heading from the compass as a floating
    + point value in degrees.
    +
    +Where: /sys/bus/i2c/devices/.../power_state
    +Date: April 2010
    +Kernel Version: 2.6.36?
    +Contact: alan.cox@intel.com
    +Description: Sets the power state of the device. 0 sets the device into
    + sleep mode, 1 wakes it up.
    +
    +Where: /sys/bus/i2c/devices/.../calibration
    +Date: April 2010
    +Kernel Version: 2.6.36?
    +Contact: alan.cox@intel.com
    +Description: Sets the calibration on or off (1 = on, 0 = off). See the
    + chip data sheet.
    +
    diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
    index 26386a9..9e825cb 100644
    --- a/drivers/misc/Kconfig
    +++ b/drivers/misc/Kconfig
    @@ -304,6 +304,13 @@ config SENSORS_TSL2550
    This driver can also be built as a module. If so, the module
    will be called tsl2550.

    +config HMC6352
    + tristate "Honeywell HMC6352 compass"
    + depends on I2C
    + help
    + This driver provides support for the Honeywell HMC6352 compass,
    + providing configuration and heading data via sysfs.
    +
    config EP93XX_PWM
    tristate "EP93xx PWM support"
    depends on ARCH_EP93XX
    diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
    index 6ed06a1..48597df 100644
    --- a/drivers/misc/Makefile
    +++ b/drivers/misc/Makefile
    @@ -28,6 +28,7 @@ obj-$(CONFIG_DS1682) += ds1682.o
    obj-$(CONFIG_TI_DAC7512) += ti_dac7512.o
    obj-$(CONFIG_C2PORT) += c2port/
    obj-$(CONFIG_IWMC3200TOP) += iwmc3200top/
    +obj-$(CONFIG_HMC6352) += hmc6352.o
    obj-y += eeprom/
    obj-y += cb710/
    obj-$(CONFIG_VMWARE_BALLOON) += vmware_balloon.o
    diff --git a/drivers/misc/hmc6352.c b/drivers/misc/hmc6352.c
    new file mode 100644
    index 0000000..a62a03b
    --- /dev/null
    +++ b/drivers/misc/hmc6352.c
    @@ -0,0 +1,199 @@
    +/*
    + * hmc6352.c - Honeywell Compass Driver
    + *
    + * Copyright (C) 2009 Intel Corp
    + *
    + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; version 2 of the License.
    + *
    + * This program is distributed in the hope that it will be useful, but
    + * WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    + * General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License along
    + * with this program; if not, write to the Free Software Foundation, Inc.,
    + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
    + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + *
    + */
    +
    +#include <linux/module.h>
    +#include <linux/init.h>
    +#include <linux/slab.h>
    +#include <linux/i2c.h>
    +#include <linux/err.h>
    +#include <linux/delay.h>
    +#include <linux/sysfs.h>
    +
    +static ssize_t compass_calibration_store(struct device *dev,
    + struct device_attribute *attr, const char *buf, size_t count)
    +{
    + struct i2c_client *client = to_i2c_client(dev);
    + int ret;
    + unsigned long val;
    + char cmd = 'C'; /* Calibrate */
    + char cmd1 = 'E'; /* Exit calibration mode */
    + struct i2c_msg msg[] = {
    + { client->addr, 0, 1, &cmd },
    + };
    + struct i2c_msg msg1[] = {
    + { client->addr, 0, 1, &cmd1 },
    + };
    +
    + if (strict_strtoul(buf, 10, &val))
    + return -EINVAL;
    + if (val == 1) {
    + ret = i2c_transfer(client->adapter, msg, 1);
    + if (ret != 1) {
    + dev_warn(dev, "i2c calib start cmd failed\n");
    + return ret;
    + }
    + } else if (val == 2) {
    + ret = i2c_transfer(client->adapter, msg1, 1);
    + if (ret != 1) {
    + dev_warn(dev, "i2c calib stop cmd failed\n");
    + return ret;
    + }
    + } else
    + return -EINVAL;
    +
    + return count;
    +}
    +
    +static ssize_t compass_heading_data_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    +
    + struct i2c_client *client = to_i2c_client(dev);
    + static char cmd = 'A'; /* Get Data */
    + unsigned char i2c_data[2];
    + unsigned int ret, ret_val;
    + struct i2c_msg msg[] = {
    + { client->addr, 0, 1, &cmd },
    + };
    + struct i2c_msg msg1[] = {
    + { client->addr, I2C_M_RD, 2, i2c_data },
    + };
    +
    + ret = i2c_transfer(client->adapter, msg, 1);
    + if (ret != 1) {
    + dev_warn(dev, "i2c cmd 0x41 failed\n");
    + return ret;
    + }
    + msleep(10); /* sending 0x41 cmd we need to wait for 7-10 milli seconds */
    + ret = i2c_transfer(client->adapter, msg1, 1);
    + if (ret != 1) {
    + dev_warn(dev, "i2c read data cmd failed\n");
    + return ret;
    + }
    + ret_val = i2c_data[0];
    + ret_val = ((ret_val << 8) | i2c_data[1]);
    + return sprintf(buf, "%d.%d\n", ret_val/10, ret_val%10);
    +}
    +
    +static ssize_t compass_power_mode_store(struct device *dev,
    + struct device_attribute *attr, const char *buf, size_t count)
    +{
    +
    + struct i2c_client *client = to_i2c_client(dev);
    + unsigned long val;
    + unsigned int ret;
    + static char cmd = 'S'; /* Sleep mode */
    + static char cmd1 = 'W'; /* Wake up */
    + struct i2c_msg msg[] = {
    + { client->addr, 0, 1, &cmd },
    + };
    + struct i2c_msg msg1[] = {
    + { client->addr, 0, 1, &cmd1 },
    + };
    +
    + if (strict_strtoul(buf, 10, &val))
    + return -EINVAL;
    +
    + if (val == 0) {
    + ret = i2c_transfer(client->adapter, msg, 1);
    + if (ret != 1)
    + dev_warn(dev, "i2c cmd sleep mode failed\n");
    + } else if (val == 1) {
    + ret = i2c_transfer(client->adapter, msg1, 1);
    + if (ret != 1)
    + dev_warn(dev, "i2c cmd active mode failed\n");
    + } else
    + return -EINVAL;
    +
    + return count;
    +}
    +
    +static DEVICE_ATTR(heading, S_IRUGO, compass_heading_data_show, NULL);
    +static DEVICE_ATTR(calibration, S_IWUSR, NULL, compass_calibration_store);
    +static DEVICE_ATTR(power_state, S_IWUSR, NULL, compass_power_mode_store);
    +
    +static struct attribute *mid_att_compass[] = {
    + &dev_attr_heading.attr,
    + &dev_attr_calibration.attr,
    + &dev_attr_power_state.attr,
    + NULL
    +};
    +
    +static struct attribute_group m_compass_gr = {
    + .name = "hmc6352",
    + .attrs = mid_att_compass
    +};
    +
    +static int hmc6352_probe(struct i2c_client *client,
    + const struct i2c_device_id *id)
    +{
    + int res;
    +
    + res = sysfs_create_group(&client->dev.kobj, &m_compass_gr);
    + if (res) {
    + dev_err(&client->dev, "device_create_file failed\n");
    + return res;
    + }
    + dev_info(&client->dev, "%s HMC6352 compass chip found\n",
    + client->name);
    + return 0;
    +}
    +
    +static int hmc6352_remove(struct i2c_client *client)
    +{
    + sysfs_remove_group(&client->dev.kobj, &m_compass_gr);
    + return 0;
    +}
    +
    +static struct i2c_device_id hmc6352_id[] = {
    + { "hmc6352", 0 },
    + { }
    +};
    +
    +MODULE_DEVICE_TABLE(i2c, hmc6352_id);
    +
    +static struct i2c_driver hmc6352_driver = {
    + .driver = {
    + .name = "hmc6352",
    + },
    + .probe = hmc6352_probe,
    + .remove = hmc6352_remove,
    + .id_table = hmc6352_id,
    +};
    +
    +static int __init sensor_hmc6352_init(void)
    +{
    + return i2c_add_driver(&hmc6352_driver);
    +}
    +
    +static void __exit sensor_hmc6352_exit(void)
    +{
    + i2c_del_driver(&hmc6352_driver);
    +}
    +
    +module_init(sensor_hmc6352_init);
    +module_exit(sensor_hmc6352_exit);
    +
    +MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
    +MODULE_DESCRIPTION("hmc6352 Compass Driver");
    +MODULE_LICENSE("GPL v2");


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